Byzantine missionaries were religious figures from the Byzantine Empire who spread Christianity, particularly the Eastern Orthodox faith, to various regions, including Slavic territories. They played a crucial role in converting people to Christianity and establishing churches, often adapting their teachings to local cultures. Two of the most notable Byzantine missionaries were Saint Cyril and Saint Methodius, who are credited with creating the Glagolitic alphabet. This early Slavic script helped translate the Bible and other religious texts, making Christianity more accessible to the Slavic peoples and significantly influencing their culture and literacy.